What's the right way of expressing a desire to meet with someone in the future on the multiple basis?

What's the right way of expressing a desire to meet with someone in the future on the multiple basis (unspecified number of times, but definitely more than once)?

1. We should surely meet again and keep in contact.
   → This may mean that I want to meet only one more time and then just keep in contact.
2. We should surely be meeting again and keep in contact
   → This will probably mean the same thing as 1.
3. We should surely meet again — and not once — and keep in contact.
   → This may mean that I want to meet perhaps only two or three times and then just keep in contact.
4. We should surely meet again in the future on the regular basis and keep in contact.
   → This may mean that I almost require a certain level of frequency of future meetings, while I am a far cry from putting such a burden on the person.

So, what should I say here?

Solution 1:

I think something like "we should keep in contact and perhaps meet up some more", as it's not necessarily upping the frequency as "on a regular basis" but it's keeping it short and by saying "some more" you're not putting a rough number on the frequency of future meetings; not putting "a burden" on the person but ensuring that you'd like to meet more than once. Also, by saying "perhaps" you're making the person more open to choice.

Solution 2:

There are several ways to say it; I might alter my wording depending on my relationship with the other person. (I might not use the same language between say, a colleague at work, and a girl I was interested in dating.)

In the general case, I might opt for:

We should get together on a regular basis.

"Get together" implies face-to-face, and "on a regular basis" conveys more than a one-time subsequent meeting.

Also, I'd avoid using the word "surely" in the request; it sounds out of place for some reason. If you wanted to include an extra qualifier to connote that sentiment, you might try this instead:

We should definitely get together on a regular basis.

which sounds more enthusiastic, but might sound overly desperate, too, if you don't know the other person very well.

If this was more of a request, and you wanted to allow the other person opt out of it without the awkwardness of feeling impolite, you could phrase it in the form of a question:

Maybe we could start meeting regularly?

Solution 3:

"Let's keep in touch" will do. It nearly conveys all the things you listed, in an implicit way. It also sounds better.

Solution 4:

Let us always meet up in future

gives a sense of an endless number of meetings.