Wearing My Retainer After 5 Years – Closing Small Gaps?

i should start off by specifying that i dont have money for any orthodontics. my insurance is bare minimum and i simply dont have the money for short term braces or invisalign.
when i wa 15 i got my braces off. i wore my retainer until my doctor told me i didnt need to anymore about a year later.
its been five years now, and i have small spaces in the top of the front of my smile. they really arent bad at all,
my retainer still fits, just with a gap between my teeth and the plastic, but i can get it on. im wondering if i wear it how it would take me to get back to normal.?
i know that its different for everyone and without seeing no one can be sure, but there are relatively small spaces and im simply asking for an educated guess.
im also asking if anyone advises me not to do this seeing as its been about 4 years since i had it in last? theres a decent amount of space between my top and botom teeth. my bottom retainer still fits perfectly with no gaps.
thanks guys!

Is Invisalign Good For Opening Gaps For Implants?

I need an experienced ortho for this question. i’ve gotten consultations from several orthodontist who say metal braces are the only option for me, but one insisted that invisalign would work well.
I have a gap on my top right side. Im missing tooth #5 (premolar), and the cuspid has moved completely to the right . Over time my midline has also shifted to my right side and I am developing small spaces inbetween teeth. I want to open the gap from the missing tooth so that I can put in an implant. But the gap is not small, and i only want to move the cuspid and the midline back over to the left. SO…
I dont want to pay more or get braces if I dont have to. Would Invisalign be good for this job, or is my only option traditional braces? Thanks!