I don't know who needs to hear this but, (assuming 2026 and 2028 elections aren't sham elections rigged by MAGA) the way to align the Democratic party more closely with your own personal interests is to vote for it.
Every single time.
Every single election.
Every single candidate.
Voting is a 2-way street. You vote for the party that more closely aligns with your interests, and in return, the party aligns its interests more closely with the people who voted for it.