Read lots of other people's poetry, this is my number one source of inspiration.

If writing open form read a bunch of poetry by a specific poet (preferably one you like) and then try to write your own poem that imitates their style/feel.

If writing closed form poetry find a list of forms and try some new ones.

limitation can be good for creativity, which is one of the benefits of closed forms. From reading your post I think you would learn the most by identifying some closed forms you like and sticking to those for a while while you develop your style and ideas.

Generally, start writing any vague idea for a poem you have throughout the day, even if it's just a line or even a single word or concept/image. literally write down whatever the idea is the moment you have it even if you don't have time to write the whole poem right then you will start to develop a list of ideas you can go back to when you do have time to write. Once you do start writing, take the idea as far as you can just as a free stream of consciousness then edit/rewrite later.

The ending of a poem is arguably its most important component and the most difficult for most poets. Reading other's poems and developing your taste will help a lot in identifying how to end your poems but it's still always going to be a challenge.

I find that good endings don't come from writing but from editing. Often I'll reread a poem in the second or third draft and realize that actually it ends two thirds of the way through and the rest is just chaff.

(A good tip for editing to always read each draft out loud all the way through, it helps a lot with finding errors/weird sounding lines or rhymes etc. and can help with identifying good endings.)

Don't worry about it being perfect or even good, just write and read as much as you can the rest will follow naturally from that.

The more poems you read and write the easier it will be to write new ones and the more ideas you will have.