While ultimately important, voting isn't enough.
Nor is getting others to vote.
Real activism creates change by consistent inlfuence.
One and done doesn't cut it.
Contacting you reps is the single most important way to influence their vote. All have a district office, and a constituent correspondence rep.
Establish a relationship with them, be courteous, concise, and calm. Look good and speak intelligenly. Use phone, email, and social media to get the message out. Get others to this also.
Join and support and participate in your local/state 2A organization.
Good luck