"suggestions are welcome" is correct and usable in written English. You can use it when you want to invite others to provide ideas or feedback on a particular topic or issue. For example, "We would love to hear your opinions on our proposal; suggestions are welcome.".
Suggestions are welcome below.
Any suggestions are welcome.
Readers' suggestions are welcome.
Other readers' suggestions are welcome.
In both cases, your criticisms and alternative suggestions are welcomed in the comments section.
P&O has yet to decide how it will choose the winning name, although the spokeswoman said all suggestions were welcome and "some kind of voting element" was likely.
These included that there were no right or wrong answers and that all ideas, comments, and suggestions were welcome.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com