Over more than two decades of writing (yikes), one of the biggest factors in how I'm doing is how much support I have from other people.
In my teens, for instance, I belonged to a creative writing group that met weekly. I doubt I'd have written much without weekly deadlines (and sharing my work for feedback helped me to improve my writing skills fast).
Later, I took a creative writing Masters degree, and the group support and commmitment to writing from people around me helped me write Lycopolis.
You might not have a writing group, but there are likely other people who could help encourage and support you with your writing. How about:
A friend. It's likely that you already know someone who's a writer (or aspiring writer). You just might not realise it yet! Send out a message on WhatsApp, Facebook, email, or however you keep in touch: ask if anyone else out there is writing.
A past colleague or fellow student. Maybe you worked with someone in the past who was writing a novel on the side, or perhaps you took a course and met some other writers. If you still have contact details, why not get in touch? Ask how their writing's going and what their goals are. They might be really glad to have some mutual support.
Your partner. I know this doesn't work for all writers (and sadly, it's not infrequent that I hear about spouses who are actively unhelpful or critical). But even if your spouse doesn't "get" writing, they might still be able to support you in practical ways, like helping you arrange your writing space.
An online group. There are loads of online forums, Facebook groups, Twitter chats, private paid groups, and more that are devoted to writing. One of these could be filled with people who can help re-enthuse you about writing again.
If you've ever worked with me or bought anything from me (even if it was years ago), you're welcome to join the Aliventures Club group on Facebook. Each Monday, we share our writing plans for the week and encourage one another.
Being a writer can feel lonely at times ... but it doesn't need to be. Find one person (or a group of people) and reach out to them today. You might recover your writing mojo faster than you think.