If you aren't a developer than here are ways to contribute:

*1) Educate yourself more- https://lopp.net/bitcoin.html *2) Run an economic full node - https://btcinformation.org/en/wallets/desktop/windows/bitcoincore/ *3) Possibly mine with an ASIC after doing 100 hours of research - https://bitcointalk.org/index.php?board=14.0 *4) Perform translations- https://github.com/achow101/btcinformation.org https://github.com/bitcoin-core/bitcoincore.org *5) write documentation https://github.com/achow101/btcinformation.org https://github.com/bitcoin-core/bitcoincore.org https://en.bitcoin.it/wiki/Main_Page http://lopp.net/bitcoin.html https://github.com/jlopp/lopp.net/blob/master/bitcoin.html *6) Start a blog , or write articles on medium about bitcoin. *7) Participate more on social media websites and forums educating others *8) Attend local meetups and discuss Bitcoin IRL *9) Sell Bitcoin locally *10) manage a bitcoin atm *11) Set various buy limit orders (In addition to buying Bitcoin at regular intervals) on an exchange you use with deposited fiat. This will decrease Bitcoin's volatility by increasing buy limit support which is critical to both investor confidence and Bitcoin maturing into a stable currency and a less volatile unit of account. The side benefit is you can auto pickup any dips and save money. *12) Help answer new user questions on r/BitcoinBeginners *13) Invest in more Bitcoin , but focus on spending and replacing as well to support local businesses that accept Bitcoin. *14) Help local Merchants accept Bitcoin *13) Help test open source bitcoin software by reporting any bugs you find to the developers. Most projects have a github page which has an issue tracker. *14) Donate to open source bitcoin projects and other bitcoin-related volunteer efforts. *15) Provide liquidity in joinmarket *16) Provide liquidity on Bisq *17) Buy Bitcoin and securely store it *18) Spend money (BTC) with merchants that accept Bitcoin and replace the spent BTC. Better yet , go to a bar or restaurant that accepts Bitcoin with friends and family and pay the bill with Bitcoin in front of them to show them how easy it is.