you can invest on gambling site but remember , it has risk of lossing if you did not experience for doing this or
You can try open any shop that accept bitcoin so you will got bitcoin profit
Yeah 0.1 will not be worth to hold for a long term, in fact I would choose to take risk and use them in gambling and try my luck there so I can earn quick profits if I am lucky.
To be honest 0.1 is not a big amount, so even if we loose in gambling then it won't affect our financial status but if you are lucky and if its your day then you can make it really big even in a single day.