Taking the correct steps towards becoming fluent when speaking spanish?!

Hi!

This year I want to make big steps towards becoming fluent in Spanish. I remember a decent amount from school, taking basic Spanish classes from 3rd grade through highschool, if not every year, most years. I have 3 children (ages 9,8,6)who are half Mexican, and spent at least 4/5 years living with their native speaking aunts and grandparents. My partner of 4 years, is a native speaker as well. My children’s daycare teachers for the last 6-7 years are all spanish speaking, no english. I have retained a bunch -I feel, so like knowing my numbers, colors, food, places etc. I have started brushing up on conjugations, but a majority has stuck. So the thing is I UNDERSTAND, but not fully. ANYWAYS, its a personal goal of mine , for myself and my children to become fluent. My kids speak a bit at daycare but they’re not really building on it. I want to take courses but they are expensive and seem to be broken into so many lessons, it’s not realistic to pay thousands over the course of the next few years. I will eventually take classes once I feel like I’ve done all I can for myself. So my question is.. HANDS DOWN, what has helped you make the most progress in conversational speaking and fluency? I have anxiety around speaking, I know so many people whose first language is spanish, but I feel anxious about it when it’s my time to shine. ALSO, what should I use to fill the gaps? And continue to build vocabulary?To stop thinking of how to conjugate and recall words when I do need to respond to someone. Its NOT the simple “como estas?” It’s the stringing together 2 or more full sentences.

Thanks in advance! I see things like reading books or watching movies in spanish or talking to native speakers…but what else?