I've been tossing around the idea of starting a group of people who are committed to buying Bitcoin every month. Can be a small portion, like 5$, or however much people can afford (I suppose it would make sense to use higher amounts for fee reasons, though). I myself have set up a monthly wire transfer from my bank account to Coinbase and a recurring purchase of Bitcoin every 1st day of the month. This is really simple, and you keep investing and $-cost-averaging your BTC purchases.

To be clear: I don't want you to send money to me or anybody else, I don't want to make money decisions for you and this is not investment advice. What this is about:
1. Explaining the benefits of buying periodically
2. Showing ways to do so
3. Compile a bunch of people who want to display their commitment to buying Bitcoin

Also, I don't really care what you do with the BTC you purchase over time. Of course, in order to keep demand up you may want to HODL them or earn interest by lending them. Otoh, if you want to foster adoption, I'm also more than happy if you spend them. And, of course feel free to sell them after a bull run. I don't mind, so long as you keep buying every month :-)

If you already have set up recurring purchases or you plan to, feel free to fill in the Google form and I can link it to a spreadsheet. I might also prepare kind of a guide to give some background information.

I created a Google Form where anyone who wants to express their commitment to BTC can do so: https://forms.gle/rjD81677yipAVhtaA

Again, I'm not planning on making money from that, just want BTC to have a healthy demand.