How can I make my characters movement better?

Hi I made a script for basic movement and it works however I do not like how my character jumps because it really fast goes up and then falls for much longer time. Please could you tell me what can I chancge to fix it.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class movement : MonoBehaviour
 {
     public float moveSpeed = 5f;
     public float jumpForce = 10f;
     public float gravityModifier = 10f;
 
 
     public float jumpTimeTimer = 0.35f;
     public float maxJumpTime = 0.35f;
 
     
     private float horizontalDirection;
 
     private bool onGround;
     private bool isJumping = false;
     public LayerMask GroundMask;
     public Transform feet;
 
 
     
     Rigidbody2D rb;
     CircleCollider2D circle;
 
     void Start()
     {
         rb = GetComponent<Rigidbody2D>();
         circle = GetComponent<CircleCollider2D>();
     }
 
     void Move()
     {
         horizontalDirection = Input.GetAxisRaw("Horizontal");
         rb.velocity = new Vector2(horizontalDirection,0)*moveSpeed;        
     }
 
     void Jump()
     {  
         if(isJumping && onGround)
         {
             rb.velocity += Vector2.up * jumpForce;
         }
 
         if(isJumping)
         {
             rb.velocity += Vector2.up * jumpForce;
         }
 
         if(rb.velocity.y<0)
         {
             rb.velocity += Vector2.up * Physics2D.gravity.y * (gravityModifier-1) * Time.deltaTime;
         }
     }
 
     void JumpDetection()
     {
         if(Input.GetKeyDown(KeyCode.Space)&& onGround)
             isJumping = true;
 
         if(Input.GetKey(KeyCode.Space) && isJumping)
             if(jumpTimeTimer>0)
             {
                 isJumping = true;
                 jumpTimeTimer -= Time.deltaTime;
             }else{
                 isJumping = false;
             }
 
         if(Input.GetKeyUp(KeyCode.Space))
             isJumping = false;
     }
 
 
     void GroundCheck()
     {
         onGround = Physics2D.OverlapCircle(feet.position,0.1f,GroundMask);
 
         if(onGround)
             jumpTimeTimer = maxJumpTime;
     }
 
     void FixedUpdate()
     {
         Move(); 
         Jump();
     }
 
     void Update()
     {
         JumpDetection();
         GroundCheck();
     }
 }
 

And those are my Rigidbody settings.