It could be as simple as keeping our coin in non-custodial wallets, promoting P2P, engaging in Bitcoin awareness, or even advocating for the legalization of Bitcoin in our home country.
Yes, even by doing the things that you mentioned we can support Bitcoin. I believe the best step one can do to help Bitcoin is by promoting the use of non-custodial personal wallets as such type of wallets can help investors from unwanted attackers.
Another thing I like about those mentioned things is the effort we could make to legalize Bitcoin in our countries. It's not an easy task to convince a government to legalize Bitcoin but with right steps things can be good.