if you do not have an abundance of funds to invest to different kinds of assets then just pick one that is solid and can offer you good profit and at the same time not too risky since this is your only investment
There is no investment that will give high returns with low risk, maybe gold but the profits obtained are very small and will not be comparable to the time spent, the only best way with limited funds is to take risks in one asset by continuing to learn it and the choice is bitcoin, yes this asset can still provide 10x or even more profits in the long term.