From the research we did, paid LinkedIn marketing is only valuable if you can afford to do highly targeted remarketing. Ie, being certain you can target the same person many times with the same ad. Remarketing has a significantly high ROI if you can pull it off. But users often need to see the same advertisement 5+ times (often more) before they will trust it.
... Of course it depends on what your product is too, and whether your product has a high enough value (or lifetime expected value) for the acquisition cost required.
Otherwise the most reliable is to post regular, and useful, content. Something we need to pick back up on now! Thanks for the reminder!!
a tips i learned that, share only things that have learning stuff, i found learning stuff have more engagement than any other related to field or niche