thanks for your query
At 45, if your previous attempts at IVF and ICSI
have failed, chances for you to conceive spontaneously are very low.
Please consult an Infertility
specialist and an Dietician and do not take any medications without guidance and prescription.
If you are not ovulating, and your ovarian reserve
is very low, then IVF with donor oocytes maybe tried.
You might also go for more attempts at IVF/ICSI , but only your INfertility specialist would be able to tell you the best course of action ahead after your complete examination and investigations.
Do not delay , as further ageing would only hamper your chances.
take care and all the best.