As I progressed into the Junior cat, I got a feel of what the life in the mtb world was like, I travelled a lot with the national team and I had some really good junior years. With a really nice balance between, racing, training, school and social life. Which I think, looking back, was one of the key factors to my later success. 
Now that was a lot about me, but what about you? or your daughter or son?

1) A dropper post
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This gift will bring joy, trust me, when riding you will feel more confident, comfortable and it will improve your riding.
When I'm using the dropper post, I use the KS suspension: 
https://kssuspension.com/product-category/droppers/

2) Suspension service
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Give him/her a gift card to the local bike shop where they can get a fork or shork service. This is something  we don't do enough, but oh, when we do it feels great! Almost like a new bike :) (PLUS it also supports the local businesses in these Corona times) 

3) A bling-bling Chain
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We all want our bikes to look 'mazing. A golden chain really makes any bike look SO much cooler. 
I'm riding KMC chain's 12speed (you need to check the current chain they are riding to know what kind of 'speed' you need to buy. Don't ask me why its called speed). 
Link https://www.kmcchain.com/en/product/bicycle-chain-x12-12-speed

4) Winter jacket
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Oh baby it's cold outside! Give the cycling-addicted person a warm winter jacket for riding outside. (The bonus is that you will avoid to have them laying on the sofa warming up the rest of the day, and actually be able to do something else with you. Avoid buying this, if you like them to lay still and be quiet).
I'm riding the EKOI winter jackets. And I'm hot 

5) New bike day!
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I have no idea about your budget, but if you are the bike-aholic you might want to give someone else the joy you feel from riding bikes! You could buy with a nice commute or gravel bike, to get them started. 
Orbea (my sponsor) has some nice ones! ​https://www.orbea.com/es-es/bicicletas/urbanas/vector/cat/vector-drop

6) Thule gear
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The Swedish brand Thule, has lot's of great stuff for the outdoor life! It could be a bikerack for some awesome adventures or it could be their bags. I use the Chasm line in green and the Easy Fold XT 2 rack. The products are such a good quality and so useful
​https://www.thule.com/da-dk/luggage/travel-duffel-bags/thule-chasm-90l-_-3204300

7) A handlebar Bag
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I know this is a hype, but give them this hipster accessory and they will love it. There are plenty of brands who makes this just google it! You can fill them up with extra tube, energibars, a pump and more!
(I actually put this item on my wish list :D ) 

8) A Smart trainer
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It's a little bit like the indoor bike your grandparents might have, but a little cooler. And slightly better.. ;) Again, I don't know your budget, but this is a way to give your bike-enthusiast more time at hand, because he/she wont be able to train nearly as long as outside! There is different brands, an idea could be the Kickr! 

9) Coffee Beans
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As every cyclist your cyclist is probably also a self claimed coffee expert, so give him some quality beans! Might be from your local roastery or fx Yellow Bird Coffee in Copenhagen;
 https://spinchy.com/da/shop/los-urena/ 
Tip; figure out if you have a grinder, if not, get the beans grined and not whole-beans. 

10) Cyclist coffee cup

Now when we are talking coffee, then what about a cute coffee cup to fit the lifestyle? There are plenty out there on the internet, but maybe your local bikeshop/cafe has some for sale? 

As important it is to dwell on the past, to learn, as important it is to look at the present moment and at the future. “What can I do today to get better tomorrow”
For now, what I can do to get better, is to unwind & look forward. Next year is going to be so crazy and so fun. I better charge the batteries. I think we are fooling ourselves if we think that the Covid situation is going to change a whole lot just because the calendar changes it’s look, but we did gain a lot of experience this year, so I’m confident that we can pull of the 21’ racing season in a pretty good way. ​